Kohler is living on its name and how things look, not necessarily on how well they work or whether they are maintainable. They are definately one of those NIH (not invented here) places, where if they didn't invent it, it couldn't be any good even if the rest of the world finds it works just fine. As a result, you get some really weird stuff when you look beneath the pretty exterior. This means that Kohler is often the only place you can get repair parts since they tend to change things on a regular basis (my thought, if it aint broke, don't fix it; improve it, okay, but it has to be worth the change). If you look at a lot of the Kohler toilets, you'll see that the drain line makes a very sharp right-angle turn where it exits the toilet. This works okay on liquids, but is hell on 'normal' solids. They get decent ratings on the MAP test, partly because that uses plastic wrapped paste, which is a poor simulation of the real thing. I don't sell the things, but after installing a pair in my home, I bought more and did it in my mother's house. They work as advertised. The Toto dealer locator tends to only show the bigger places, but sometimes you'll get the best price from your local supply store that may either stock them, or will order them for you. It's worth the call around.